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RISS 인기검색어
- 검색키워드
- 저자 : Héctor J. Cruzado (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Wind tunnel studies of cantilever traffic signal structures
Héctor J. Cruzado,Chris Letchford,Gregory A. Kopp 한국풍공학회 2013 Wind and Structures, An International Journal (WAS Vol.16 No.3
The wind-induced vibrations of the mast arm of cantilever traffic signal structures can lead to the fatigue failure of these structures. Wind tunnel tests were conducted on an aeroelastic model of this type of structure. Results of these experiments indicated that when the signals have backplates, vortex shedding causes large-amplitude vibrations that could lead to fatigue failure. Vibrations caused by galloping were only observed for one particular angle of attack with the signals having backplates. No evidence for galloping,previously thought to be the dominant cause of fatigue failures in these structures, was observed.
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Full-scale experiments of cantilever traffic signal structures
Héctor J. Cruzado,Chris Letchford 한국풍공학회 2013 한국풍공학회지 Vol.17 No.1
Wind-induced vibrations of mast arms of cantilever traffic signal structures can lead to fatigue failure. Two such structures were instrumented each with a sonic anemometer and a camera that records the motions of the tip of the arm. It was observed throughout this experiment that large amplitude vertical vibrations of mast arms with signals with backplates occur for the most part at low wind speed ranges, between 2 to 7 m/s, and as the wind speed increases the amplitude of the vertical vibrations decreases. The results of these experiments contradict the generally accepted belief that vortex shedding does not cause significant vibrations of mast arms that could lead to fatigue failure, which have been attributed to galloping in the past . Two damping devices were tested with mixed results.
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